Heimdall SEO

Instant on-page SEO audit: indexability, meta, headings, images, links, hreflang, structured data — highlighted on the page.

Heimdall SEO audits the page you are viewing in one click — and shows the problems right on the page. Open the side panel on any website and get a complete on-page SEO check in seconds: what Google can index, what is missing, and what to fix first. No account, no setup, no data sent anywhere. ━━━━━━━━━━━━━━━━━━━━ WHAT HEIMDALL CHECKS ━━━━━━━━━━━━━━━━━━━━ ◆ TL;DR — a one-line verdict at the top: can the page be indexed, and the three things to fix first. ◆ Summary — every check at a glance, with colour-coded priorities. ◆ Indexability — HTTP status code, full redirect chain, meta robots / googlebot, canonical (self-canonical, missing or pointing elsewhere). ◆ Meta — title and meta description with character AND pixel length, so you know exactly what will be truncated in Google. ◆ Headings — the full H1–H6 outline, with warnings for missing or multiple H1s, skipped levels, empty, duplicate or hidden headings. ◆ Images — missing or empty alt text, dimensions, and file format (from heavy BMP/TIFF to lightweight WebP/AVIF). ◆ Links — internal vs external, follow / nofollow / sponsored / UGC, empty hrefs, and a broken-link checker that tests every URL (404, redirects, errors). ◆ Content — word count, thin-content warning, weighted keyword frequency and word cloud, and Lorem Ipsum detection. ◆ Multilingual — hreflang tags, missing x-default, duplicate languages, and status of every alternate URL. ◆ Structured data — every JSON-LD block, its type, syntax errors and common mistakes, with one-click access to Schema.org and Google's Rich Results Test. ◆ Social — Open Graph and Twitter / X Card tags, so your pages look good when shared. ━━━━━━━━━━━━━━━━━━━━ SEE IT ON THE PAGE ━━━━━━━━━━━━━━━━━━━━ Turn on the overlay to highlight headings, images and links directly on the page, and click any item in the panel to scroll straight to it. 👁 Heimdall Vision reveals hidden content — text and elements hidden with CSS — so you can see what users don't, but search engines might. Light or dark: the panel follows your system theme, and one click switches it. ━━━━━━━━━━━━━━━━━━━━ PRIVATE BY DESIGN ━━━━━━━━━━━━━━━━━━━━ Everything runs locally in your browser. Heimdall does not collect, store or share any data: no account, no analytics, no tracking. Link checks are sent without cookies, like an anonymous visitor. Built by TL;DR SEO — SEO and GEO explained, verified, sourced. https://tldr-seo.fr